Mold.



'No. 714,560; Patented Nov. 25, I902.

. A. A. CLARK.

MOLD.

(Application flled'Mar. 22, 1902.)

(No Model.)

Fries.

ArnNr ALFRED CLARK, OF JACKSON, MICHIGAN.

MOLD.

SPECIFICATION forming part of Letters Patent No. 714,560, dated November 25, 1902. Application filed March 22, 1902. Serial No. 99,534. (No modal.)

1'0 all whom it mctycmwern:

Be it known that I, ALFRED A. CLARK, a citizen of the United States, residing at Jackson, in the county of Jackson and State of Michigan, have invented certain new and useful Improvements in Molds, of which the following is a specification.

This invention relates to molds, and has for its object to provide a cheap, durable, and efficieut means for forming tanks and other vessels from grout, concrete, or other plastic material.

To this end the invention consists of certain novel features of construction and arrangement of parts, all of which will be clearly described hereinafter, reference being had to the accompanying drawings, in which- Figure 1 is a perspective view of a mold constructed in accordance with myinvention. Fig. 2 is a top plan view of the inner member of the mold. Fig. 3 is a detail perspective view of one of the mold-sections, and Fig. 4 is a similar view of one of the truss-bars. V

In carrying out the purpose of the invention a base of concrete or other suitable material is first laid upon a level horizontal surface.

The outer and inner members of the mold are placed upon the base, after which a circular groove is formed the width of the distance between the inner and outer member and the grou t flooded between thewheels of the respective members. This base ultimately forms the bottom of the tank by becoming an integral part of the sides, as will be presently ex plained. The outer member of the mold comprises a ring 1, which extends for a sufficient height to meet the requirements of such a device. The inner member 2 is somewhat smaller in diameter andcomprises a plurality of arcuate sections 2, each section consisting of curved strips 3, secured together by a segmentallycurved strap-iron 4,.one end. of which terminates in an extension 5, bent inwardly at an acute angle to the body portion, while the other end terminates in a similar extension'G, bentat an obtuse angle.

Each extension is perforated to receive a bolt or pin 7, which passes therethrough and secures the obtusely-bent extension of one strap-iron to the acutely-bent extension of the other, it being understood that the extension 5 on one section is bent so as to be parallelwith the extension 6 of the adjacent section when the several sections are in position to form a circle.

In order to provide additional rigidity to the inner member and strengthen the separate sections, I provide a strut 8, which consists of a bar having oppositely-bent ends 9 and 10. The end 9 is provided withaperforation 11, which alines with the perforations in the extensions 5 and 6, thus permitting the end 9 to lie contiguous to and be secured to the extension 5. The body portion of the strut rests at a tangent to the brace or strap iron 4 and has its end 9 abutting against the strap-iron 4, to which it is secured by a bolt passing through said iron and through an elongated slot 12 in the end 10, thus permitting a slight play in adjusting the strut. When the inner and outer mold members are arranged as shown in Fig. 1, grout or other material is poured between their walls and permitted to solidify. During the process of hardening the base and the grout are formed into one homogeneous mass, wherebya solid tank is the resultant product. After the hardening process has been accomplished the sections of the inner member are removed and the outer member is likewise taken away, leaving the finished article.

I do not confine myself to a particular number of sections, although for the sake of convenience five are illustrated. However, I reserve the right to employ any number which in practice may be found convenient.

Having thus described my invention, what I claim is 1. A mold for plastic materials, comprising an outer shell and an inner lining, the lining being formed of a number of arcuate sections, a brace carried by each section and terminatingin angularly-projecting extensions, astrut arranged at a tangent to the brace and secured thereto to add rigidity to the inner lining.

2. A lining for plastic molds comprising a in position, and means for securing said explurality of sections, a strap-iron secured to tensions together. V to the inner wall of each section and having end In testimony whereof I affix my signature extensions, the extension at the inner end be- I in presence of two witnesses.

5 ing bent at an acute angle, and at the other ALFRED A. CLARK.

end at an obtuse angle, the oppositely-bent Witnesses: portion being arranged to lie parallel with the EDWARD CROWE, acutely-bent extension when the sections are HARRY L. STEARNS. 

